OpenEditor

 Free, open source editor intended for Qracle SQL, but useful standalone

 Author:   Aleksey Kochetov
 Homepage: http://www.sqltools.net/openeditor.html
 Family:   SpecializedFamily
 Platform: Windows
 License:  GPL

"OpenEditor is a free (licensed under the GNU GPL) text editor for developers (particularly for oracle developers and DBAs).

It's developed for SQLTools needs but it can be useful as a standalone editor."

Ability to handle big files (>1000000 lines and >100MB), especially with memory mapped files option on.
64K characters single line limit.
MDI with multiple views for one file.
Powerful highlighting for PL/SQL, XML, C++, ....
Columnar text selection.
Color & B/W printing.
Match searching for PL/SQL (BEGIN/EXCEPTION/END).
Regular expression in text searching and replacement.
Keymap customization.
Syntax templates.
File browser

 Screenshot: